Pigs are used to inspect pipelines. No, not the farm animals, but robotic devices called pigs because of the squealing sound they make when they travel through the pipelines. “Smart” pigs are used to evaluate the inside of the pipeline and ensure that they are safe. Pigs can ensure proper pipe structure, detect signs of corrosion or leaks and also can be used to clean the lines. Smart pigs are just one of the many ways that the pipeline industry ensures safety (http://ingaa.org/3515.aspx). Pipeline operators also conduct routine aerial and walking inspections of the pipeline and they monitor the pipeline’s pressure 24/7.